✅ Swept Back Wings Explained - Why Airplanes Have Sweep Back Wings

After watching this video until the end you will learn all about the handling characteristics of swept back wings. I will be explaining why big jets land with a high nose up attitude.
Why big airplanes have swept back wings.
What is critical mach number
How does sweeping the wings back help airplanes fly faster.
Why big airplanes come in for landing with a high nose up attitude (pitch up)
Angle of attack explained
Mach Crit and Critical Mach number explained
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[@guillermobarrios8605]

Said many times here but once again great video! Very complete and great explanations.

[@ATPLStudent]

I'm glad you found it helpful. thanks for watching

[@diegom8]

why should the any flow travel perpendicular to the wing chord? How does this flow separation affect the lift and drag characteristics? Maybe the answer is from the fact that spanwise flow no longer contributes to lift. Since that component is no longer contributing to lift, then the speed of the air over the wing decreases or is less than it would be if it was a straight wing. At this point I'm speculating and want to see if any of you can confirm this?

[@ATPLStudent]

That is indeed correct, when sweeping the wings backwards, the airflow is divided into Chord wise and Span wise. the span wise flow is as you mentioned pile up near the wingtips, as for the chord wise (the perpendicular component is less, thus the aircraft feels as if it was flying "slower". This is the method used to primarily delay or increase Mcrit, thus delaying air flow separation due to shockwaves formation when approaching the speed of sound.

[@Human-hb5up]

Still wondering, why wing designers do note make a straight wing with exact the chord-profile they get from a back swept wing. Is there another advantage? More space for fuel?

[@ahmedmaan2973]

Brilliant !

[@ATPLStudent]

Thanks for watching

[@kiwidev9320]

Thanks so much really good explanation

[@ATPLStudent]

Glad it was helpful!

[@mohamedazizkhelifi705]

Good job very nice explanation

[@ATPLStudent]

Thanks mate

Thank you! 👍

[@ATPLStudent]

You're welcome!

[@jbol2454]

How is a swept wing affected if it gets a larger surface area? So Boeing 747 with a normal wing and a 747 with a wing that extends back and has more surface area?

[@user-mu8tp7mn6e]

Thank you 🫶🏻👏🏻

[@ATPLStudent]

You’re welcome 😊

[@marcoaurelioxaviermoreira4631]

Great!!

[@ATPLStudent]

Thank you sir

[@matg2002]

Great video as always but the audio gain level of your commentary is very low which makes it hard to listen to outside or on a bus (even with headphones) :(

[@ATPLStudent]

Noted! Thank you for your suggestion will work on it

[@rayhuang9944]

Great video, well done! But at 6:11, did you mean “high lift” devices instead of “high speed” devices?

[@ATPLStudent]

You are right nice catch 👌

[@merhancan424]

Much appreciated

[@samoo8933]

why the stall happens at wing tip did not get that? Also, why wing tip travels faster the the wing base?

[@samoo8933]

?

[@ATPLStudent]

Thank you for your question;
At low speed, the AoA is relatively higher, this means the span-wise flow (which is a component of the relative air flowing over the wing)) flows from the root towards the wingtip (due to sweepback design of the wing), as we approach the wingtip this span-wise flow tends to accumulate, when this happens it disturbs the flow over the wing tip, thus the wingtip no longer generates sufficient lift, therefore it stalls FIRST,.. This is why we need Slats and Flaps during approach and landing, and whenever operating at slow speeds.

[@tharindujayawardana7596]

very good landing though

[@ATPLStudent]

Thanks for watching mate

[@fewscattered]

I think you should get some fresh microphone

[@ATPLStudent]

Yeah I should indeed